@inproceedings{Cheswick96,
	address={San Jose, CA},
	author={William R. Cheswick and Steven M. Bellovin},
	booktitle={Proceedings of the Sixth {USENIX} \Unix\ Security Symposium},
	pages={15--19},
	title={A {DNS} Filter and Switch for Packet-filtering Gateways},
	year=1996,
}